Wrack mostly consists of the kelp that washes onto beaches from the ocean. Wrack is an essential part of the ecology of the shoreline, providing food and habitat for everything from insects to birds.
Santa Rosa Island - total
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Macrophyte beach wrack percent cover at Santa Rosa Island is shown by species. Wrack primarily consists of Macrocystis (Giant kelp) or Phyllospadix (surf grass); however these two key types of wrack show recent decreases in percent cover. Figure: Channel Islands National Park
Santa Rosa Island - per site
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Macrophyte wrack species composition at eight sites on Santa Rosa Island. Wrack primarily consists of Macrocystis pyrifera (giant kelp) and Phyllospadix (surf grass) which varies from 0 to > 50% coverage; however, these two key wrack types show recent decreases in percent cover. Figure: Channel Islands National Park